- Dawson Casting: The National Service recruits, who should be in their late teens or early 20s, were all played by actors who were over 30 at the time of filming (in fact, Charles Hawtrey was over 40, Kenneth Connor nearly so).
- Deleted Role: Alec Bregonzi, in his film debut, was one of the kit issuers and had a dialogue scene with Bob Monkhouse cut leaving him in just a bit part.
- Dolled-Up Installment: The film was based on a play The Bull Boys by R. F. Delderfield and was adapted into a script by Norman Hudis with John Antrobus contributing additional material and replacing the conscripted ballet dancers of the novel into a married couple.
- Hostility on the Set: There was tension between Bernard Kay and William Hartnell, and Hartnell desperately wanted him to be kicked off the project.
- Name's the Same: There was another film made in Canada some 30 years earlier had the same title although that one was not a comedy.
- The Other Marty:
- Gordon Tanner replaced another actor who pulled out.
- Patrick Newell was originally cast, but when he turned up on the first morning he saw that the army sergeant who was going to drill the actors for the film was the same one that had drilled him when he was in the army and said that he wasn't going to go through that again and left.
- The Pete Best: Bob Monkhouse was probably the most famous cast member (aside from William Hartnell), but never appeared again in the series.
- Throw It In!: Kenneth Williams ad-libbed the word, "Charming!" when the large cap is placed on his head. Ad-libbing was usually frowned upon but on this occasion it was kept in.
Trivia / Carry On, Sergeant